Small kidney of unknown cause (N27)

ICD-10 code N27 covers conditions where a kidney is unusually small without a known cause, including cases affecting one kidney (unilateral), both kidneys (bilateral), or when the side is unspecified. These codes help specify the diagnosis for medical records and treatment planning.

This section includes N27.0 for a small kidney on one side (sometimes called small left kidney or small right kidney), and N27.1 for small kidneys on both sides, also known as bilateral small kidney. If the documentation doesn’t specify which kidney is affected, N27.9 applies, encompassing terms like "contracted kidney" or "irregularly contracted kidney." Using the correct code ensures clarity when coding for "small kidney," "small left kidney," or "small right kidney" conditions of unknown origin. Medical coders looking for the ICD-10 code for small kidney will find this block is dedicated to identifying those unusual kidney size findings without a clear cause, allowing precise classification in clinical and billing contexts.